How to install Squid Proxy Server on Ubuntu 20.04 LTS Linux

To install Squid proxy server on Ubuntu 20.04 LTS Linux, you can follow these steps:

1. Open a terminal window on the Ubuntu system.

2. Update the package manager's list of available packages. You can use the apt-get command with the update option to update the package manager's list of available packages. For example:

sudo apt-get update

3. Install Squid proxy server using the apt-get command with the install option. You can specify the squid package name to install Squid proxy server. For example:

sudo apt-get install squid

The apt-get command will install Squid proxy server and all its dependencies on the Ubuntu system.

4. Once the installation is complete, Squid proxy server will be automatically started. You can verify that Squid proxy server is running by using the systemctl command with the status option and the squid unit. For example:

sudo systemctl status squid

The output will show the status of Squid proxy server and whether it is running or not. For example:

● squid.service - LSB: Squid HTTP Proxy version 3.x
   Loaded: loaded (/etc/init.d/squid; generated)
   Active: active (running) since Mon 2021-01-01 12:00:00 UTC; 5s ago
     Docs: man:systemd-sysv-generator(8)

5. To configure Squid proxy server, you can edit the /etc/squid/squid.conf file. You can use the nano or vi text editor to edit the file. For example:

sudo nano /etc/squid/squid.conf

In the squid.conf file, you can specify the various settings and configurations for Squid proxy server. For example, you can specify the port number, the cache size, the allowed clients, and the access controls.

6. Save the changes to the squid.conf file and exit the text editor.

7. Restart Squid proxy server to apply the changes. You can use the systemctl command with the restart option and the squid unit to restart Squid proxy server. For example:

sudo systemctl restart squid

After following these steps, Squid proxy server will be installed and configured on the Ubuntu 20.04 LTS Linux system.

Keep in mind that you must have the necessary permissions to edit the /etc/squid/squid.conf file on your system. If you do not have the necessary permissions, the text editor will display an error message.

For more information on how to install and configure Squid proxy server on Ubuntu Linux, you can refer to the Squid documentation or the Ubuntu documentation.